// 实现这个项目的构建任务
const { src, dest, watch, series, parallel } = require('gulp');
const del = require('del')
const browserSync= require('browser-sync')
const devServer = browserSync.create()


const gulpLoadPlugins = require('gulp-load-plugins')
const plugins = gulpLoadPlugins()

const data = {
    menus: [
      {
        name: 'Home',
        icon: 'aperture',
        link: 'index.html'
      },
      {
        name: 'About',
        link: 'about.html'
      },
      {
        name: 'Contact',
        link: '#',
        children: [
          {
            name: 'Twitter',
            link: 'https://twitter.com/w_zce'
          },
          {
            name: 'About',
            link: 'https://weibo.com/zceme'
          },
          {
            name: 'divider'
          },
          {
            name: 'About',
            link: 'https://github.com/zce'
          }
        ]
      }
    ],
    pkg: require('./package.json'),
    date: new Date()
  }




const style = () => {
  return src('src/assets/styles/*.scss', { base: 'src' })
  .pipe(plugins.sass({ outputStyle: 'expanded' }))
  .pipe(dest('temp'))
  .pipe(devServer.reload({stream: true}))
};

const script = () => {
    return src('src/assets/scripts/*.js', { base: 'src' })
    .pipe(plugins.babel({ presets: ['@babel/preset-env']}))
    .pipe(dest('temp'))
    .pipe(devServer.reload({stream: true}))
}

const htmls = () => {
    return src('src/*.html', { base: 'src' })
    .pipe(plugins.swig( { data, cache: false} ))
    .pipe(dest('temp'))
    .pipe(devServer.reload({stream: true}))
}

const img = () => {
    return src('src/assets/images/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const font = () => {
    return src('src/assets/fonts/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const publics = () => {
    return src('public/**', { base: 'public' })
    .pipe(dest('dist'))
}

const clean = () => {
    return del(['dist', 'temp'])
}

const serve = () => {
    watch('src/assets/styles/*.scss', style)
    watch('src/assets/scripts/*.js', script)
    watch('src/*.html', htmls)
    watch(['src/assets/images/**','src/assets/fonts/**','public/**'], devServer.reload)


    devServer.init({
        server: {
            baseDir: ['temp', 'src', 'public'],
            routes: {'/node_modules': 'node_modules'}
        },
        notify: false,
        port: 8080,
        open: true,
        // files: 'temp/**'
    })
}

const useref = () => {
    return src('temp/*.html', { base: 'temp'})
    .pipe(plugins.useref({searchPath: ['temp', '.']}))

    .pipe(plugins.if(/\.js$/, plugins.uglify()))
    .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
    .pipe(plugins.if(/\.html$/, plugins.htmlmin({
        collapseWhitespace: true,
        minifyCSS: true,
        minifyJS: true,
        minifyURLs: true,
    })))
    .pipe(dest('dist'))
}

const dev = parallel( style, script, htmls)

const start = series( dev, serve)

const build = series( clean, parallel(series( dev, useref), img, font, publics))

module.exports = {
    clean,
    serve,
    start,
    build,
}

